clean /tmp directory on cold start

app/src/main/java/com/termux/app/TermuxActivity.java

@@ -69,6 +69,7 @@ import com.termux.view.TerminalView;
 
 import java.io.File;
 import java.io.FileInputStream;
+import java.io.IOException;
 import java.io.InputStream;
 import java.util.Arrays;
 import java.util.Collections;
@@ -612,6 +613,18 @@ public final class TermuxActivity extends Activity implements ServiceConnection
             new AlertDialog.Builder(this).setTitle(R.string.max_terminals_reached_title).setMessage(R.string.max_terminals_reached_message)
                 .setPositiveButton(android.R.string.ok, null).show();
         } else {
+            if (mTermService.getSessions().size() == 0 && !mTermService.isWakelockEnabled()) {
+                File termuxTmpDir = new File(TermuxService.PREFIX_PATH + "/tmp");
+                if (termuxTmpDir.exists()) {
+                    try {
+                        TermuxInstaller.deleteFolder(termuxTmpDir);
+                    } catch (Exception e) {
+                        e.printStackTrace();
+                    }
+
+                    termuxTmpDir.mkdirs();
+                }
+            }
             String executablePath = (failSafe ? "/system/bin/sh" : null);
             TerminalSession newSession = mTermService.createTermSession(executablePath, null, null, failSafe);
             if (sessionName != null) {

app/src/main/java/com/termux/app/TermuxService.java

@@ -250,6 +250,14 @@ public final class TermuxService extends Service implements SessionChangedCallba
         return mTerminalSessions;
     }
 
+    public boolean isWakelockEnabled() {
+        if (mWakeLock == null) {
+            return false;
+        } else {
+            return mWakeLock.isHeld();
+        }
+    }
+
     TerminalSession createTermSession(String executablePath, String[] arguments, String cwd, boolean failSafe) {
         new File(HOME_PATH).mkdirs();